The following table summarizes the four main types of conditional sentences used in English grammar:

| Pitfall | Example error | Exercise antidote | |---------|---------------|--------------------| | Future in if-clause | “If it will rain, I will stay” | Transform “when/if” sentences; contrast with “when” clauses | | Double would | “If I would be rich, I would travel” | Error correction + contrast with first conditional | | Tense backshift neglect | “If I knew yesterday…” | Time-adverb forced choice: “yesterday” forces past perfect | | Mixed time confusion | “If I had studied, I would be rich” (correct but learner thinks it’s wrong) | Explicit labeling exercises: “Past condition → Present result” | | Overuse of zero conditional | Using zero for one-off future possibilities | Context classification: “Which type fits this real situation?” |

Exercises lose value without targeted feedback. Effective correction does not just mark “wrong” but explains the .

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